CN110700909B - Internet surfing electric load adjusting system and adjusting method for heating Ji Re cogeneration unit - Google Patents
Internet surfing electric load adjusting system and adjusting method for heating Ji Re cogeneration unit Download PDFInfo
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- CN110700909B CN110700909B CN201911067574.XA CN201911067574A CN110700909B CN 110700909 B CN110700909 B CN 110700909B CN 201911067574 A CN201911067574 A CN 201911067574A CN 110700909 B CN110700909 B CN 110700909B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000003303 reheating Methods 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000010248 power generation Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 230000001172 regenerating effect Effects 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention discloses a heating season cogeneration unit internet-surfing electric load adjusting system and an adjusting method, which solve the problem of how to realize adjustment of the internet-surfing electric load of the cogeneration unit in a larger range in heating seasons. The main steam heat exchange system and the reheat heat section steam heat exchanger are arranged, so that the main steam inlet amount of the high-pressure cylinder and the regenerative heat section steam inlet amount of the medium-pressure cylinder of the steam turbine generator unit are reduced, the power generation load of the high-pressure cylinder and the medium-pressure cylinder of the unit is reduced, and the heat exchanged by the heat exchange system is used for heating or other heat-requiring systems; in order to overcome the defect of reduced output steam pressure caused by reduced steam in a middle-high pressure cylinder, an ejector is arranged to improve the steam pressure of a cold section of a steam turbine; and injecting and connecting part of reheated heat section steam subjected to heat exchange to the low-pressure cylinder through an injector so as to ensure the minimum steam flow required by low-pressure safe operation and the steam quantity required by the low-pressure heater for heating the condensate water, and ensure the safety of the operation of the low-pressure cylinder of the unit and the deoxidization effect of the deoxidizer.
Description
Technical Field
The invention relates to a cogeneration unit, in particular to a system and a method for realizing the adjustment of the internet power load of the cogeneration unit in a larger range in heating seasons.
Background
The power grid mainly comprising the thermal generator set is connected with clean energy sources such as wind power generation, photovoltaic power generation and the like, the power generation capacity of the clean energy sources is fully exerted in heating seasons, the duty ratio of the thermal power generation is reduced, the thermal generator set is environment-friendly and the conventional means adopted for ensuring power supply are adopted, and the adjustment range of the internet load of the thermal generator set is required to be enlarged so as to fully exert the power generation capacity of the clean energy sources; the cogeneration unit generally follows the design thought of using heat to decide electricity, and in heating season, the cogeneration unit has lower adjustment capability (generally called as on-line electric load adjustment capability) for conveying electric energy to a power grid on the premise of ensuring heat supply, and the reason is that: the thermoelectric coupling, the heat supply and steam extraction are directly connected from the middle pressure cylinder of the steam turbine to exhaust, in order to achieve higher heat supply capacity, the needed heat supply and steam extraction amount is more, namely, the steam amount passing through the high and middle pressure cylinders of the unit is more, so that the generating load of the unit is higher, the mode is a good design in the period of power failure, and at present, the generating load of the cogeneration unit needs to be reduced due to the fact that the installed capacity of the new energy unit is continuously enlarged, so that the advantage of the unit is changed into a disadvantage at present. At present, the adjustment capacity range of the internet-surfing electric load of the conventional cogeneration coal-fired unit is 30% -90%, the adjustment lower limit is higher, and the field requirement cannot be met; in order to increase the adjustment capability of the internet-surfing electric load of the cogeneration coal-fired unit, the prior art has the following modes: (1) The low-pressure cylinder zero-output transformation is carried out, but the temperature of condensate entering the deaerator is reduced by the low-pressure cylinder zero-output transformation, so that the deaeration effect of the deaerator is reduced, the water quality of boiler feed water is influenced, the safe operation of the boiler is influenced, after the low-pressure cylinder zero-output transformation, the steam inlet quantity of the low-pressure cylinder is very low, the problems of air blast and overtemperature exist in the last stage of blades of the low-pressure cylinder, and the operation life of the low-pressure cylinder blades of a unit is influenced; (2) The high-low pressure bypass is modified by reducing the temperature of main steam and reheat steam of a unit through a water spray temperature reducing valve, so that energy is wasted, and meanwhile, after the bypass is modified, the pressure of reheat cold section steam is not matched with the pressure required by a boiler, so that the flow rate of the boiler steam exceeds the design flow rate, and hidden danger is brought to the safe operation of the boiler; (3) The capacity of the electric boiler matched with the heat accumulation transformation is very large, and is generally more than 30% of rated power generation load of a unit, and the equipment resetting rate is too high.
Disclosure of Invention
The invention provides a heating season cogeneration unit internet-surfing electric load adjusting system and an adjusting method, which solve the technical problem of how to realize that the internet-surfing electric load of the cogeneration unit can be adjusted in a larger range in heating seasons.
The invention solves the technical problems by the following technical proposal:
the general conception of the invention is that: the main steam heat exchange system and the reheat heat section steam heat exchanger are arranged, so that the main steam inlet amount of the high-pressure cylinder and the regenerative heat section steam inlet amount of the medium-pressure cylinder of the steam turbine generator unit are reduced, the power generation load of the high-pressure cylinder and the medium-pressure cylinder of the unit is reduced, the heat exchanged by the heat exchange system is used for heat supply or other heat demand systems, and the waste of energy is avoided; in order to overcome the defect of reduced output steam pressure caused by reduced steam of a medium-high pressure cylinder, the ejector is arranged to improve the steam pressure of the cold section of the steam turbine so as to meet the requirements of a boiler end, and the problem of overspeed steam operation flow rate of a heat exchange tube in the boiler is avoided; and injecting and connecting part of reheated heat section steam subjected to heat exchange to the low-pressure cylinder through an injector so as to ensure the minimum steam flow required by low-pressure safe operation and the steam quantity required by the low-pressure heater for heating the condensate water, thereby ensuring the safety of the operation of the low-pressure cylinder of the unit and the deoxidization effect of the deoxidizer.
The utility model provides a heating season cogeneration unit online electrical load regulating system, including steam boiler, the high pressure jar, middling pressure jar and low pressure jar, steam boiler's superheater export is in the same place with the main steam entry intercommunication of high pressure jar through main steam pipeline, high pressure jar's exhaust steam mouth is in the same place with steam boiler's reheat steam entry intercommunication through reheat cold section pipeline, steam boiler's reheat steam export is in the same place with the steam inlet intercommunication of middling pressure jar through reheat hot section pipeline, middling pressure jar's steam exhaust steam mouth is in the same place with the steam inlet intercommunication of low pressure jar through middling pressure jar exhaust steam pipeline, be connected with peak regulating main steam heat exchanger steam input pipeline on main steam pipeline, peak regulating main steam heat exchanger steam input pipeline's the other end is in the same place with peak regulating main steam heat exchanger's heat exchange steam entry connection, a heat exchange steam output port of the peak shaving main steam heat exchanger is connected with a peak shaving main steam heat exchanger steam output pipeline, the other end of the peak shaving main steam heat exchanger steam output pipeline is connected with a high-pressure steam inlet of a peak shaving main steam ejector, a first shutoff valve is arranged on the peak shaving main steam heat exchanger steam input pipeline, a second shutoff valve is arranged on the peak shaving main steam heat exchanger steam output pipeline, a third shutoff valve is arranged on a reheating cold section pipeline, a peak shaving main steam ejector low-pressure steam input pipeline is arranged on the reheating cold section pipeline between the third shutoff valve and a steam outlet of a high-pressure cylinder, the other end of the peak shaving main steam ejector low-pressure steam input pipeline is connected with a low-pressure steam inlet of the peak shaving main steam ejector, a seventh shutoff valve is arranged on the peak shaving main steam ejector low-pressure steam input pipeline, the intermediate pressure steam output pipeline of the peak regulation main steam ejector is arranged on the reheating cold section pipeline between the third shut-off valve and the reheater steam inlet of the steam boiler, the other end of the intermediate pressure steam output pipeline of the peak regulation main steam ejector is communicated with the intermediate pressure steam output port of the peak regulation main steam ejector, and the intermediate pressure steam output pipeline of the peak regulation main steam ejector is provided with an eighth shut-off valve.
A fourth shutoff valve is arranged on the steam exhaust pipeline of the medium pressure cylinder, a low-pressure steam input pipe of the peak-shaving section ejector is arranged on the steam exhaust pipeline of the medium pressure cylinder between the fourth shutoff valve and the steam exhaust port of the medium pressure cylinder, the other end of the low-pressure steam input pipe of the peak-shaving section ejector is connected with the low-pressure steam input port of the peak-shaving section ejector, a tenth shutoff valve is arranged on the low-pressure steam input pipe of the peak-shaving section ejector, a high-pressure steam input port of the peak-shaving section ejector is connected with a peak-shaving section heat exchanger output pipeline, the other end of the peak-shaving section heat exchanger output pipeline is connected with a heat exchange steam output port of the peak-shaving section heat exchanger, the heat exchange steam input port of the peak shaving section heat exchanger is connected with a peak shaving section heat exchanger steam input pipeline, the other end of the peak shaving section heat exchanger steam input pipeline is connected with a reheat section pipeline, a fifth shutoff valve is arranged on the output pipeline of the peak shaving section heat exchanger, a sixth shutoff valve is arranged on the steam input pipeline of the peak shaving section heat exchanger, a peak shaving section ejector medium pressure steam output pipeline is connected to the medium pressure steam output port of the peak shaving section ejector, the other end of the peak shaving section ejector medium pressure steam output pipeline is communicated with the steam inlet of the low pressure cylinder, and a ninth shutoff valve is arranged on the medium pressure steam output pipeline of the peak shaving section ejector.
The method for adjusting the internet-surfing electric load adjusting system of the heating season cogeneration unit is characterized by comprising the following steps of: opening the first shut-off valve, the second shut-off valve, the seventh shut-off valve and the eighth shut-off valve, and leading part of main steam in the main steam pipeline to the peak shaving main steam heat exchanger, so as to reduce the steam inlet quantity of a high-pressure cylinder of the unit, thereby reducing the generating capacity of the unit; after the introduced part of main steam exchanges heat in the peak shaving main steam heat exchanger, the main steam enters a peak shaving main steam ejector through a steam output pipeline of the peak shaving main steam heat exchanger to serve as a high-pressure steam source of the peak shaving main steam ejector, exhaust steam of a steam turbine on a reheating cold section pipeline enters a low-pressure inlet of the peak shaving main steam ejector through a low-pressure steam input pipeline of the peak shaving main steam ejector to serve as a low-pressure steam source of the peak shaving main steam ejector, and the injected medium-pressure steam enters a reheater steam inlet of a steam boiler through a medium-pressure steam output pipeline of the peak shaving main steam ejector, so that safe and stable operation of the boiler is ensured; and opening a sixth shut-off valve, a fifth shut-off valve, a ninth shut-off valve and a tenth shut-off valve, wherein part of reheat hot section steam on a reheat cold section pipeline enters the peaking hot section heat exchanger through a peaking hot section heat exchanger steam input pipeline, the steam after heat exchange enters a high-pressure steam output port of a peaking hot section ejector through a peaking hot section heat exchanger output pipeline, part of steam in a steam exhaust port of a medium-pressure cylinder enters a low-pressure steam output port of the peaking hot section ejector through a peaking hot section ejector low-pressure steam input pipeline, and the injected medium-pressure steam enters a low-pressure cylinder through a peaking hot section ejector medium-pressure steam output pipeline, so that safe and stable operation of a unit low-pressure cylinder is ensured.
The invention has the beneficial effects that on the premise of ensuring the safe and stable operation of the unit, the internet power load adjusting capability of the coal-fired unit is improved, thereby improving the adjusting capability of a power grid, promoting the consumption of new energy sources such as wind power, photoelectricity and the like, improving the utilization rate of the new energy sources, reducing the emission of pollutants and improving the atmosphere quality.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
a heating season cogeneration unit internet-surfing electric load adjusting system comprises a steam boiler 1, a high-pressure cylinder 2, a medium-pressure cylinder 3 and a low-pressure cylinder 4, wherein a superheater outlet of the steam boiler 1 is communicated with a main steam inlet of the high-pressure cylinder 2 through a main steam pipeline 5, a steam outlet of the high-pressure cylinder 2 is communicated with a reheater steam inlet of the steam boiler 1 through a reheating cold section pipeline 6, a reheater steam outlet of the steam boiler 1 is communicated with a steam inlet of the medium-pressure cylinder 3 through a reheating hot section pipeline 7, a steam outlet of the medium-pressure cylinder 3 is communicated with a steam inlet of the low-pressure cylinder 4 through a medium-pressure cylinder steam outlet pipeline 8, a peak-regulating main steam heat exchanger steam input pipeline 9 is connected to the main steam pipeline 5, the other end of the peak-regulating main steam heat exchanger steam input pipeline 9 is connected with a heat exchange steam inlet of the peak-regulating main steam heat exchanger 10, a heat exchange steam output port of the peak shaving main steam heat exchanger 10 is connected with a peak shaving main steam heat exchanger steam output pipeline 11, the other end of the peak shaving main steam heat exchanger steam output pipeline 11 is connected with a high-pressure steam inlet of a peak shaving main steam ejector 12, a first shutoff valve 13 is arranged on a peak shaving main steam heat exchanger steam input pipeline 9, a second shutoff valve 14 is arranged on the peak shaving main steam heat exchanger steam output pipeline 11, a third shutoff valve 15 is arranged on a reheating cold section pipeline 6, a peak shaving main steam ejector low-pressure steam input pipeline 16 is arranged on the reheating cold section pipeline 6 between the third shutoff valve 15 and a steam outlet of a high-pressure cylinder 2, the other end of the peak shaving main steam ejector low-pressure steam input pipeline 16 is connected with a low-pressure steam inlet of the peak shaving main steam ejector 12, a seventh shutoff valve 27 is arranged on the low-pressure steam input pipeline 16 of the peak-shaving main steam ejector, a medium-pressure steam output pipeline 17 of the peak-shaving main steam ejector is arranged on the reheat cold section pipeline 6 between the third shutoff valve 15 and the reheater steam inlet of the steam boiler 1, the other end of the medium-pressure steam output pipeline 17 of the peak-shaving main steam ejector is communicated with a medium-pressure steam output port of the peak-shaving main steam ejector 12, and an eighth shutoff valve 28 is arranged on the medium-pressure steam output pipeline 17 of the peak-shaving main steam ejector.
A fourth shutoff valve 23 is arranged on the middle pressure cylinder steam exhaust pipeline 8, a peak-shaving heat section ejector low pressure steam input pipe 22 is arranged on the middle pressure cylinder steam exhaust pipeline 8 between the fourth shutoff valve 23 and a steam exhaust port of the middle pressure cylinder 3, the other end of the peak-shaving heat section ejector low pressure steam input pipe 22 is connected with a low pressure steam input port of the peak-shaving heat section ejector 21, a tenth shutoff valve 30 is arranged on the peak-shaving heat section ejector low pressure steam input pipe 22, a peak-shaving heat section heat exchanger output pipeline 20 is connected to a high pressure steam input port of the peak-shaving heat section ejector 21, the other end of the peak-shaving heat section heat exchanger output pipeline 20 is connected with a heat exchange steam output port of the peak-shaving heat section heat exchanger 19, the other end of the peak-shaving heat section heat exchanger steam input pipeline 18 is connected with a low pressure steam input port of the reheat section ejector 21, a fifth shutoff valve 25 is arranged on the peak-shaving heat section heat exchanger output pipeline 20, the peak-shaving heat section ejector output pipeline 24 is connected with a heat exchange steam output port of the peak-shaving heat section ejector 24, and the other end of the peak-shaving heat section ejector 24 is connected with a peak-shaving heat section ejector output pipeline 24, and the other end of the peak-shaving heat section ejector output pipeline 24 is connected with the peak-shaving heat section ejector output port of the peak heat section ejector 24, and the peak-shaving heat section ejector output port is connected with the peak-pressure output pipeline 24, and the peak-shaving heat section ejector output port is connected with the peak, and the peak-shaving heat section ejector output port, and the peak-pressure ejector output valve is connected with the peak, and the ejector and is connected with the ejector, and is connected to the ejector.
The method for adjusting the internet-surfing electric load adjusting system of the heating season cogeneration unit is characterized by comprising the following steps of:
opening the first shut-off valve 13, the second shut-off valve 14, the seventh shut-off valve 27 and the eighth shut-off valve 28 to lead a part of main steam in the main steam pipeline 5 to the peak shaving main steam heat exchanger 10, so as to reduce the steam inlet quantity of a high-pressure cylinder of the unit, thereby reducing the generating capacity of the unit; after the introduced part of main steam exchanges heat in the peak shaving main steam heat exchanger 10, the main shaving steam enters the peak shaving main steam ejector 12 through the steam output pipeline 11 of the peak shaving main steam heat exchanger and is used as a high-pressure steam source of the peak shaving main steam ejector 12, the exhaust steam of the steam turbine on the reheat cold section pipeline 6 enters a low-pressure inlet of the peak shaving main steam ejector 12 through the low-pressure steam input pipeline 16 of the peak shaving main steam ejector as a low-pressure steam source of the peak shaving main steam ejector 12, and the injected medium-pressure steam enters a reheater steam inlet of the steam boiler 1 through the medium-pressure steam output pipeline 17 of the peak shaving main steam ejector, so that the safe and stable operation of the boiler is ensured;
and a sixth shut-off valve 26, a fifth shut-off valve 25, a ninth shut-off valve 29 and a tenth shut-off valve 30 are opened, part of reheat hot-section steam on the reheat cold-section pipeline 6 enters the peaking hot-section heat exchanger 19 through the peaking hot-section heat exchanger steam input pipeline 18, heat-exchanged steam enters a high-pressure steam output port of the peaking hot-section ejector 21 through the peaking hot-section heat exchanger output pipeline 20, part of steam in a steam exhaust port of the medium-pressure cylinder 3 enters a low-pressure steam output port of the peaking hot-section ejector 21 through the peaking hot-section ejector low-pressure steam input pipeline 22, and injected medium-pressure steam enters the low-pressure cylinder 4 through the peaking hot-section ejector medium-pressure steam output pipeline 24, so that safe and stable operation of the unit low-pressure cylinder is ensured.
On the premise of ensuring the safe operation of the unit, the invention can improve the adjusting range of the unit to 15% -90%, and the adjusting capability is improved by 15%; the system improves the adjusting capability of the power grid by improving the adjusting capability of the unit, and promotes the consumption of new energy sources such as wind power, photoelectricity and the like; the system is particularly suitable for the heat and power cogeneration unit, and because the current heat and power cogeneration unit is designed or subjected to heat and power setting, the adjustable range of the heat and power cogeneration unit in a heating season is very small and is about 60% -90%, and the adjusting range of the heating Ji Re heat and power cogeneration unit is 15% -90% on the premise of ensuring heat supply by the system, so that the adjusting capability is improved by 15%; the heating season is also the peak period of wind power generation, improves the adjusting capability of the thermoelectric unit, and plays a positive promoting role in improving the utilization rate of wind power in the heating season.
Claims (1)
1. A regulating method of an on-line electric load regulating system of a heating season cogeneration unit is carried out by the heating season cogeneration unit on-line electric load regulating system, the regulating system comprises a steam boiler (1), a high-pressure cylinder (2), a medium-pressure cylinder (3) and a low-pressure cylinder (4), a superheater outlet of the steam boiler (1) is communicated with a main steam inlet of the high-pressure cylinder (2) through a main steam pipeline (5), an exhaust steam port of the high-pressure cylinder (2) is communicated with a reheater steam inlet of the steam boiler (1) through a reheating cold section pipeline (6), a reheater steam outlet of the steam boiler (1) is communicated with a steam inlet of the medium-pressure cylinder (3) through a reheating heat section pipeline (7), a steam outlet of the medium-pressure cylinder (3) is communicated with a steam inlet of the low-pressure cylinder (4) through a medium-pressure cylinder exhaust pipeline (8), a peak-regulating main steam heat exchanger steam input pipeline (9) is connected to the main steam pipeline (5), a peak-regulating main steam heat exchanger steam outlet (10) of the peak-regulating main heat exchanger is connected with a main heat exchanger steam heat exchanger (11) of the main heat exchanger, the peak-regulating heat exchanger is connected with a main heat exchanger (10) of the main heat exchanger, and the main heat exchanger is connected with a main heat exchanger steam heat exchanger (11) of the main heat exchanger is connected with the main heat exchanger steam heat exchanger (2, a first shutoff valve (13) is arranged on a steam input pipeline (9) of the peak shaving main steam heat exchanger, a second shutoff valve (14) is arranged on a steam output pipeline (11) of the peak shaving main steam heat exchanger, a third shutoff valve (15) is arranged on a reheat cold section pipeline (6), a low-pressure steam input pipeline (16) of the peak shaving main steam ejector is arranged on the reheat cold section pipeline (6) between the third shutoff valve (15) and a steam outlet of the high-pressure cylinder (2), the other end of the low-pressure steam input pipeline (16) of the peak shaving main steam ejector is connected with a low-pressure steam inlet of the peak shaving main steam ejector (12), a seventh shutoff valve (27) is arranged on a low-pressure steam input pipeline (16) of the peak-shaving main steam ejector, a medium-pressure steam output pipeline (17) of the peak-shaving main steam ejector is arranged on a reheat cold section pipeline (6) between the third shutoff valve (15) and a reheater steam inlet of the steam boiler (1), the other end of the medium-pressure steam output pipeline (17) of the peak-shaving main steam ejector is communicated with a medium-pressure steam output port of the peak-shaving main steam ejector (12), and an eighth shutoff valve (28) is arranged on the medium-pressure steam output pipeline (17) of the peak-shaving main steam ejector; a fourth shutoff valve (23) is arranged on the middle pressure cylinder steam exhaust pipeline (8), a peak-shaving heat-stage ejector low-pressure steam input pipe (22) is arranged on the middle pressure cylinder steam exhaust pipeline (8) between the fourth shutoff valve (23) and the steam exhaust port of the middle pressure cylinder (3), the other end of the peak-shaving heat-stage ejector low-pressure steam input pipe (22) is connected with the low-pressure steam input port of the peak-shaving heat-stage ejector (21), a tenth shutoff valve (30) is arranged on the peak-shaving heat-stage ejector low-pressure steam input pipe (22), a peak-shaving heat-stage heat-exchanger output pipeline (20) is connected on the high-pressure steam input port of the peak-shaving heat-stage ejector (21), the other end of the peak-shaving heat-stage heat-exchanger output pipeline (20) is connected with the heat-exchanging steam output port of the peak-shaving heat-stage heat exchanger (19), the other end of the peak-shaving heat-stage heat-exchanger steam input pipeline (18) is connected with the low-pressure steam input port of the peak-shaving heat-stage ejector (21), the peak-shaving heat-stage heat-exchanger output pipeline (26) is connected with the peak-shaving heat-pump output port of the peak-stage heat-pump output pipeline (25) on the peak-shaving heat-stage ejector (20), the other end of the peak-shaving heat-stage ejector output pipeline (25) is connected with the peak-shaving heat-stage ejector output port of the peak-stage heat-pump output pipeline (25), the other end of the medium-pressure steam output pipeline (24) of the peak-shaving section ejector is communicated with a steam inlet of the low-pressure cylinder (4), and a ninth shutoff valve (29) is arranged on the medium-pressure steam output pipeline (24) of the peak-shaving section ejector; the method is characterized by comprising the following steps of:
opening a first shut-off valve (13), a second shut-off valve (14), a seventh shut-off valve (27) and an eighth shut-off valve (28), and leading part of main steam in a main steam pipeline (5) to a peak shaving main steam heat exchanger (10) to reduce the steam inlet quantity of a high-pressure cylinder of the unit, thereby reducing the generating capacity of the unit; after the introduced part of main steam exchanges heat in the peak shaving main steam heat exchanger (10), the main steam enters the peak shaving main steam ejector (12) through a steam output pipeline (11) of the peak shaving main steam heat exchanger and is used as a high-pressure steam source of the peak shaving main steam ejector (12), the exhaust steam of the steam turbine on the reheating cold section pipeline (6) enters a low-pressure inlet of the peak shaving main steam ejector (12) through a low-pressure steam input pipeline (16) of the peak shaving main steam ejector and is used as a low-pressure steam source of the peak shaving main steam ejector (12), and the ejected medium-pressure steam enters a reheater steam inlet of the steam boiler (1) through a medium-pressure steam output pipeline (17) of the peak shaving main steam ejector, so that the safe and stable operation of the boiler is ensured;
the method comprises the steps of opening a sixth shut-off valve (26), a fifth shut-off valve (25), a ninth shut-off valve (29) and a tenth shut-off valve (30), wherein part of reheat hot section steam on a reheat cold section pipeline (6) enters a peaking hot section heat exchanger (19) through a peaking hot section heat exchanger steam input pipeline (18), heat exchanged steam enters a high-pressure steam output port of a peaking hot section ejector (21) through a peaking hot section heat exchanger output pipeline (20), part of steam in a steam exhaust port of a medium-pressure cylinder (3) enters a low-pressure steam output port of the peaking hot section ejector (21) through a peaking hot section ejector low-pressure steam input pipe (22), and injected medium-pressure steam enters a low-pressure cylinder (4) through a peaking hot section ejector medium-pressure steam output pipeline (24), so that safe and stable operation of the unit low-pressure cylinder is ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911067574.XA CN110700909B (en) | 2019-11-04 | 2019-11-04 | Internet surfing electric load adjusting system and adjusting method for heating Ji Re cogeneration unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911067574.XA CN110700909B (en) | 2019-11-04 | 2019-11-04 | Internet surfing electric load adjusting system and adjusting method for heating Ji Re cogeneration unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110700909A CN110700909A (en) | 2020-01-17 |
| CN110700909B true CN110700909B (en) | 2023-11-24 |
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